style: clean lint warnings introduced by parallel-queue change

- Drop unused `import json` from new test module (F401).
- Remove unused `# noqa: BLE001` directives — project ruff config doesn't
  enable BLE001 so the suppressions were dead weight (RUF100 x3).
- Replace `×` (U+00D7) with ASCII `x` in console output (RUF001).
- Collapse seed-strategy if/else into ternary (SIM108).
- Use `enumerate(as_completed(...), start=1)` for completion counter
  instead of manual `completed = 0; completed += 1` (SIM113).
- Run `ruff format` on touched files.

Pre-existing lint errors on master (PLC0415/PLR0915/SIM113 in unrelated
commands) are untouched — separate cleanup PR if desired. Net delta of
this branch over master: 0 new lint errors.

All 374 tests still passing.

tensors/cli.py

@@ -927,8 +927,7 @@ def generate(  # noqa: PLR0915
         # files, each task must take the non-JSON path. We render our own JSON
         # at the end, so the per-task --json is incompatible.
         console.print(
-            "[red]--json is not supported with --parallel-queue > 1 "
-            "(would skip the file-save step). Drop one or the other.[/red]"
+            "[red]--json is not supported with --parallel-queue > 1 (would skip the file-save step). Drop one or the other.[/red]"
         )
         raise typer.Exit(1)
     # ---- --input merging (JSON or YAML) ----
@@ -1086,7 +1085,7 @@ def generate(  # noqa: PLR0915
             with Database() as _db:
                 _db.init_schema()
                 _base_model = _db.get_base_model_by_filename(model)
-        except Exception:  # noqa: BLE001
+        except Exception:
             pass
         _detected = detect_model_family(model, _base_model)
         _fam = family or _detected
@@ -1099,10 +1098,7 @@ def generate(  # noqa: PLR0915
     #   --seed >= 0 → use as base, increment per job (reproducible series)
     #   --seed == -1 → pick a fresh random seed PER JOB so parallel runs aren't
     #                  accidentally correlated (each thread gets variety)
-    if seed >= 0:
-        seeds = [seed + i for i in range(count)]
-    else:
-        seeds = [_rng.randint(0, 2**32 - 1) for _ in range(count)]
+    seeds = [seed + i for i in range(count)] if seed >= 0 else [_rng.randint(0, 2**32 - 1) for _ in range(count)]
 
     # Output paths: mirror the existing `count > 1` naming convention from
     # _run_generation (stem_NNN.ext). When --output is omitted, leave per-task
@@ -1117,8 +1113,7 @@ def generate(  # noqa: PLR0915
 
     if not json_output:
         console.print(
-            f"[dim]Parallel queue: {effective_parallel} concurrent submissions "
-            f"× {count} images (output may interleave)[/dim]"
+            f"[dim]Parallel queue: {effective_parallel} concurrent submissions x {count} images (output may interleave)[/dim]"
         )
 
     common_kwargs: dict[str, Any] = {
@@ -1171,7 +1166,7 @@ def generate(  # noqa: PLR0915
         except typer.Exit as ex:
             result["duration_sec"] = round(_time.perf_counter() - start, 2)
             result["error"] = f"generate exited with code {ex.exit_code}"
-        except Exception as ex:  # noqa: BLE001
+        except Exception as ex:
             result["duration_sec"] = round(_time.perf_counter() - start, 2)
             result["error"] = str(ex)
         return result
@@ -1179,12 +1174,13 @@ def generate(  # noqa: PLR0915
     fan_results: list[dict[str, Any]] = []
     with ThreadPoolExecutor(max_workers=effective_parallel) as pool:
         futures = {pool.submit(_run_one, i): i for i in range(count)}
-        completed = 0
-        for fut in as_completed(futures):
-            completed += 1
+        for completed, fut in enumerate(as_completed(futures), start=1):
             try:
                 res = fut.result()
-            except Exception as ex:  # noqa: BLE001 — defensive; _run_one already swallows
+            except Exception as ex:
+                # Defensive — _run_one already swallows, but if the executor itself
+                # raises (e.g. pickling failure) we still want a well-formed result
+                # in the manifest rather than a crash.
                 res = {
                     "index": futures[fut],
                     "seed": seeds[futures[fut]],
@@ -1198,13 +1194,10 @@ def generate(  # noqa: PLR0915
                 if res["success"]:
                     where = res["output"] or "(no --output set)"
                     console.print(
-                        f"[green]\\[{completed}/{count}] seed={res['seed']} "
-                        f"ok in {res['duration_sec']:.1f}s → {where}[/green]"
+                        f"[green]\\[{completed}/{count}] seed={res['seed']} ok in {res['duration_sec']:.1f}s → {where}[/green]"
                     )
                 else:
-                    console.print(
-                        f"[red]\\[{completed}/{count}] seed={res['seed']} FAIL: {res['error']}[/red]"
-                    )
+                    console.print(f"[red]\\[{completed}/{count}] seed={res['seed']} FAIL: {res['error']}[/red]")
 
     # Reorder by original index so JSON output / final summary list is stable.
     fan_results.sort(key=lambda r: r["index"])

tests/test_generate_parallel.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import json
 from pathlib import Path
 from typing import Any
 
@@ -258,9 +257,7 @@ def test_parallel_queue_from_yaml_input(tmp_path: Path, calls: list[dict[str, An
     """parallel_queue can be set via --input YAML (mirrors other generate params)."""
     out = tmp_path / "img.png"
     yml = tmp_path / "spec.yml"
-    yml.write_text(
-        f'prompt: from-yaml\nmodel: x.safetensors\ncount: 3\nparallel_queue: 3\nseed: 7\noutput: "{out}"\n'
-    )
+    yml.write_text(f'prompt: from-yaml\nmodel: x.safetensors\ncount: 3\nparallel_queue: 3\nseed: 7\noutput: "{out}"\n')
     result = runner.invoke(app, ["generate", "--input", str(yml)])
     assert result.exit_code == 0, result.output
     assert len(calls) == 3
@@ -271,9 +268,7 @@ def test_cli_parallel_queue_overrides_yaml(tmp_path: Path, calls: list[dict[str,
     """CLI --parallel-queue wins over YAML's parallel_queue (standard precedence)."""
     out = tmp_path / "img.png"
     yml = tmp_path / "spec.yml"
-    yml.write_text(
-        f'prompt: from-yaml\nmodel: x.safetensors\ncount: 2\nparallel_queue: 1\nseed: 10\noutput: "{out}"\n'
-    )
+    yml.write_text(f'prompt: from-yaml\nmodel: x.safetensors\ncount: 2\nparallel_queue: 1\nseed: 10\noutput: "{out}"\n')
     # YAML says P=1 (sequential), CLI overrides to P=2 (fanout)
     result = runner.invoke(app, ["generate", "--input", str(yml), "-P", "2"])
     assert result.exit_code == 0, result.output